Fix UnicodeDecodeError

✅ Solution

UnicodeDecodeError usually arises when trying to decode a file or string with an encoding different from the one it was encoded with (often when the default system encoding is not UTF-8). To fix this, explicitly specify `encoding='utf-8'` when opening, reading, writing, saving, or decoding files and strings, especially in methods like `save()` that handle serialization. This ensures consistent handling of Unicode characters regardless of the system's default encoding.